Module target_features::docs::riscv

riscv documentation

Features

Feature	Description	Also Enables†
a	‘A’ (Atomic Instructions).
c	‘C’ (Compressed Instructions).
d	‘D’ (Double-Precision Floating-Point).	f
e	Implements RV{32,64}E (provides 16 rather than 32 GPRs).
f	‘F’ (Single-Precision Floating-Point).
m	‘M’ (Integer Multiplication and Division).
relax	Enable Linker relaxation..
unaligned-scalar-mem	Has reasonably performant unaligned scalar loads and stores.
v	‘V’ (Vector Extension for Application Processors).	d, f
zba	‘Zba’ (Address Generation Instructions).
zbb	‘Zbb’ (Basic Bit-Manipulation).
zbc	‘Zbc’ (Carry-Less Multiplication).
zbkb	‘Zbkb’ (Bitmanip instructions for Cryptography).
zbkc	‘Zbkc’ (Carry-less multiply instructions for Cryptography).
zbkx	‘Zbkx’ (Crossbar permutation instructions).
zbs	‘Zbs’ (Single-Bit Instructions).
zdinx	‘Zdinx’ (Double in Integer).	zfinx
zfh	‘Zfh’ (Half-Precision Floating-Point).	f
zfhmin	‘Zfhmin’ (Half-Precision Floating-Point Minimal).	f
zfinx	‘Zfinx’ (Float in Integer).
zhinx	‘Zhinx’ (Half Float in Integer).	zfinx
zhinxmin	‘Zhinxmin’ (Half Float in Integer Minimal).	zfinx
zk	‘Zk’ (Standard scalar cryptography extension).	zbkb, zbkc, zbkx, zkn, zknd, zkne, zknh, zkr, zkt
zkn	‘Zkn’ (NIST Algorithm Suite).	zbkb, zbkc, zbkx, zknd, zkne, zknh
zknd	‘Zknd’ (NIST Suite: AES Decryption).
zkne	‘Zkne’ (NIST Suite: AES Encryption).
zknh	‘Zknh’ (NIST Suite: Hash Function Instructions).
zkr	‘Zkr’ (Entropy Source Extension).
zks	‘Zks’ (ShangMi Algorithm Suite).	zbkb, zbkc, zbkx, zksed, zksh
zksed	‘Zksed’ (ShangMi Suite: SM4 Block Cipher Instructions).
zksh	‘Zksh’ (ShangMi Suite: SM3 Hash Function Instructions).
zkt	‘Zkt’ (Data Independent Execution Latency).
crt-static	Enables C Run-time Libraries to be statically linked.

^† This is often empirical, rather than specified in any standard, i.e. all available CPUs with a particular feature also have another feature.

CPUs

CPU	Enabled Features
generic	a, c, d, f, m
generic-rv32	a, c, d, f, m
generic-rv64	a, c, d, f, m
rocket	a, c, d, f, m
rocket-rv32	a, c, d, f, m
rocket-rv64	a, c, d, f, m
sifive-7-series	a, c, d, f, m
sifive-e20	a, c, d, f, m
sifive-e21	a, c, d, f, m
sifive-e24	a, c, d, f, m
sifive-e31	a, c, d, f, m
sifive-e34	a, c, d, f, m
sifive-e76	a, c, d, f, m
sifive-s21	a, c, d, f, m
sifive-s51	a, c, d, f, m
sifive-s54	a, c, d, f, m
sifive-s76	a, c, d, f, m
sifive-u54	a, c, d, f, m
sifive-u74	a, c, d, f, m
sifive-x280	a, c, d, f, m, v, zba, zbb, zfh, zfhmin
syntacore-scr1-base	a, c, d, f, m
syntacore-scr1-max	a, c, d, f, m